Machine for cutting file teth on curved surfaces



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F. F. SORENSEN ET AL MACHINE FOR CUTTING FILE TEETH ON CURVED SURFACES Filed Oct. 15. 1920 6 Sheets-S heet 3 I J l) 20 2/ z i 22 I8 F7G.4. LI, ll

MW QQWM May 29, 1923. 1,457,091

F. F. SORENSEN ET AL MACHINE FOR CUTTING FILE TEETH ON CURVED SURFACES Filed Oct. 15 1920 Sheets-Sheet 4 May29,1923. 1,457,091 F. F. SORENSEN ET AL MACHINE FOR CUTTING FILE TEETH ON CURVED SURF'AEES Fild Oct. 15. 1920' 6 Sheets-Sheet 5 W/f/WEISS. I Bank FTSorcnsen May 2-9, 1923'.

F. F. SORENSEN ET AL MACHINE FOR CUTTING FILE TEETH ON CURVED SURFACES File d Oct. 15 1920 6 Sheets-Sheet 6 Patented May 29, 1923. i i

FRANK F. sonnnsnn, OEPHILADELPHIA, PENNSYLVANIA,

' l or NEWARK, NEWJERSE MACHINE ronionrrnverrnn TEETHJ'ON oURvEn SURFACES.

Application filed October 15, 1920. Serial No. 417,165., i

To all whom it may concern:

. Be it known that we, FRANK F. SoRENsEN and WALTER D. CRAFT, citizens of the United States. residing, respectively,- at

Philadelphia, in the countyof Philadelphia,

and State of Pennsylvania, and at Newark, in the county of Essex and State-of New .;Jersey, have jointly invented a new and useful Machine for Cutting File Teeth on Curved Surfaces, of which the following is,

a specification. 1. ,7

The principal object of the present 'inven- ,tion is to provide means or mechanism for cuttingor milling file teeth on the curved surfaces of files or file blanks thereby making it possible to commercially supply socalled half-round files with milled or cut '.file I or undercut teeth on the half round faces which however are usually consider ably lessthan half a circle in cross section.

Another object of the invention is to provide for cutting or milling n? curved surfaces file teeth of either arcuate or diagonal form. Another object of the invention is to provide a complete machine for cutting or milling file or undercut teeth on the half round faces of files which shall embody the mechanism or means of the invention. Other objects of the invention will appea from the following description:

Generally stated the invention comprises a carrier for holding a file blank andexposing its curved surface to the inwardly projecting teeth-of a' ring-cutter rotating the axis ofthe blank, and the invention further comprisesthe improvements to be.

change mechanism. I

Fig. 3, is a fragmentary end elevation lookingat the right hand end of Fig. 2, and

showing clamp releasing mechanism.

Fig. 4C, is a sectional 'elevational view,

around the blank about an axis inclined to in order to show the quick return and speeddrawn to an enlarged scale andtaken on-tlie line 44 of Fig. 2.

Fig. 5, is a sectional elevation taken through the mechanism shown at the left} hand end on linei5 --5 of Fig. 2,- indicating AND ALTE CRAFT,

certain gears. in dotted lines. T

Fig. 6, a, sectional view n line, 6, 6, Fig.2, drawn to .an enlarged scale, and:

showing a side elevation of a file other parts omitted.

Fig.7, is a tranverse' sectional viewxof Fig. 6 on'line 77.

Fig. 8, is va sectional view taken on a line" similar to Figure 6, i. e. 66 of Fig. 2 illusclamp with. v I

trating one form of internal ring cutter arranged for rotation about an axis inclined to th'eaxis of a file carrier. 7 a g Fig. 9, is a face viewofthecutter head detached. 7

Fig. 10, :is a side view of the cutterheadg Flgs. 11 and 12,.are.,diagrammatic views,

illustrative of thefmilling or cutting of arcuate'and diagonal teeth, the formenas if taken on a line 11 of Fig. 8, and theflatter 'a similar view of the form shown. in Figf13.

,Fig. 13, is a partial plan illustrating ;a

cut and Fig. 14 is af'section of the on line" 1 1- 14;, 9'.

In the drawings, Fig. 8, 1 is afile carrier) adapted to expose the ourved surface a, of] a file or file blanka. '2, generally, is an internal ring cutter rotatable aroundthe blank about an'axisfas b -4B, inclined in'p respect to the axis fy, of the file afln Fig. 8. the inclination of axesmea'yand modificationlby which diagqmal teeth are y-y, is such that-'arcuate' teeth arecut on the file as shown by the full spiral lines in Fig. 11;.1The, inclination of: the axes-f law and y-y, maybe different. as shown by the position oft-he parts inFig. 13, andv in that case the teeth on the curved -sur-.- face, of the fileare diagonal as shownin' Fig. 12. In further explanation it may be said that iii-Fig. 11, the horizontal-diameter: 2 of the ring cutter is at right angles tothe.

axis of thefile and the plane of therringis inclined-to the horizontal, vs0 that arollate.

teeth are cut at the top of the file, whereas in Fig. 12, the planeof the .ring-eutter ;.is vertical in'respect-to the horizontal andthe; horizontal diameter 'ofthe'ring isginclined to the. axis of the file so that diagonal teeth are cut on the curved face of .the file; in Fig. 11 the rin is tipped about a horizontal axis and in Fig. 12 it is tipped about a vertical axis. The tools or blades 3, e1; tend progressively inward toward the center of thering cutter, as shown in Figs. 9 and 1d and they are arranged in a spiral path as shown by the full and dotted lines in Fig. 11, and they make undercut or file teeth. As shown in Fig. 8, a clamping ring 41, provided with set screws 5, and a locking ring 6, serve to hold the tools 3, in the ring head 7. The ring head 7, or otherwise stated, the complete ring cutter 2, is revolubly mounted in a bearing 8, and is turned by means of worm wheel teeth provided on its periphery. The bearing 8, is hinged on shaft 241, Fig. 1, to a carriage 10, and is adjusted by means of adjusting screws 11 and clamped by a set screw 9, Fig. 1. The carriage 10. is slidably mounted upon a frame 11, and moved thereon by a feed screw 12. The file carrier 1. is grooved at 13, Figs. 6 and 7, for the reception of file blank and. it is movable vertically by means of posts 14, slidable up and down in brackets 15, fast on the frame, in order to permit of return movement of the carriage 10, with the cutter clear of the file. is held in the groove 13, by a spring pressed roller 16, mounted in a pivotal frame 1'7, Fig. 6, and by means of a clamp 18, Fig. i, actuated by a hand wheel 19, mounted in a yoke 20, and raised by slidable rods 21, and pressed down through a spring 22. The cutter is driven through a tooth wheel 23, fast on a'shaft 24;, carried by the carriage and driven through worm gearing 25,

splined to the drive shaft 26, Figs. 2, it and 8. The carrier 1,, is raised and lowered by earns 27, mounted on short shafts 28, and acting on, the posts 14:, or more accurately on rollers carried thereby, Figs. 1, 2 and 6, and these, short shafts are geared to a counter shaft 29. The shaft 29', is turned by a quadrant 30, Figs. 2 and 3, actuated through a link and lever mechanism 81, from the starting lever 32, Fig. 1, by a rod 33. Tappets or limit stops 34 and 35, on the carriage operate the hand lever 32. The hand" lever 32, through a cross shaft 34:, arm 35 (at back of machine) rod 36, lever 37, and rod 38, turns a clutch shipper 39, Fig. 5. This clutch shipper 39, is it tedwith a spring plunger pressed arm 40, Fig. 2, so that its movements are quick and positive. The drive shaft 26-, is geared at 11', to a counter shaft 42, which througl'i worm gear 43, and bevel gear 44. drives the clutch element 45,'in one direction and at a certain speed, the; clutch element 46. being driven in the other direction and at a different speed from the counter shaft 43, through gearing 4:7. The movable clutch iementifa is shifted by the Shipper 39,

The file operated as described, so that the carriage is moved forward slowly and returned rapidly by the screw 12, which is driven from the shaft 48, to which the clutch element 47 is splined. The shaft 48, through gears -49 and .50, and an idle gear 51 (diagram Inatically shown in Fig. 2, and indicated in Fig. 5, as turnable about shaft 52) drives shaft 53, on which is slidably splined a gear 54:, Fig. 5, which meshes with a gear 55 5 gears 54 and 55, are mounted on a swinging and slidable frame 56, so that any one of the set of gear wheels 57, fast von the feed screw can be used to drive it from gear 55, through gear 54:, and shaft 53. In this way the speed of the feed can beadjusted by manipulating the lock handle 58. 59. is an oil catcher.

In use a blank (4, is mounted on the car-1 rier 1, by means of the described clamps, and the inclined" internal ring cutter 2, while surrounding it is fed toward the left by the movement of the carriage 10, and mills'on its curved surface a, either arcuate file teeth, Figs. 1 to 11. or diagonal'file teeth, Figs. 12 and 13. The limit stop 34, operates the lever 32. causing the carrier 1, to be lowered through the described mocha nism actuated by rod 38, and also causing the carriage to be returned through the, action of the reverse gear controlledby rod 36, to the limit stop 35'. The finished file-is; then removed and the operation repeated with other files.

Modificationsmay be obviously made in details of construction and arrangement without departing from the spirit of the invention which isnot limited as to such matters or otherwise than as the prior art and the appended claims may require.

We claim:

1. A machine for cut-ting or milling file teeth on curved faces of files'comprising-the combination of a rotary internal ring cutter. 'a file blank carrier adapted to expose the curved face of'a file blank through the cutter, means for relatively feeding the car- I rier andcutter. and provisions for rotating" the cutter about an axis inclined to the axis of the fil'e' blank.

2. 'A machine for cutting or milling file teeth on curved faces of files comprising the" combination of arevolving internal ring cutter. and means for relatively feeding a blank through the same in a direction in clined to the axi s of rotationof the cutter.

3. Ainachine for cutting or milling-file teeth on curved faces of files comprising the combination of a rotating internal ringcutter. and a file carrier, the axis of rotation" of the cutter and the axis ofthe file carrier being inclined in respect to each other.

A machine for cutting or milling fi'le teeth on curved faces of files com-prising the combination of rotating internal ring cutter having internally projecting teeth of progressivelyincreasing lengths and disposed spirally in respect to the axis of the cutter,

and a carrier for presenting thecurved surface exposed, an internal ring cutter surrounding the blank and operating on its curved surface and arranged for rotationin a plane inclined to the axis of the blank, and means for feeding the cutter endwise of the blank.

6. A machine for cutting or milling file teeth on curved faces of files comprisingthe combination'of a file carrier for holding a file blank With its curved surface exposed, an internally toothed ring cutter surrounding the blank and operative on its curved surface and arranged for rotation in a plane inclined to the. axis of the blank, means for feeding the cutter endwise of the blank, and provisions for shifting the carrier in respect to "the teeth of the cutter to clear the, blank during retrograde movement of the cutter. I

7. A machine for cutting-for milling file teeth on curved faces of files comprising the combination of detachable holding means for a file blank, a rotating internal ring cutter surrounding the blank and arranged for operation at an inclination to the axis thereof, and means for relatively feeding the holding stantially as describe v 8. A machine for cutting or teeth on curved faces of files comprising the combination of holding vfan inclined bearing'hinged to the, head, an

internal ring cutter rotatable in the inclined bearing and surrounding the blank, means for rotating the cutter, and adjusting devices interposed between the head and bearing to vary in respect to the axis of the blank.

FRANK F. SORENSEN. WALTER D. CRAFT.

means and cutter, submilling j file means for a file.

blank, a head movable endWise of the blank, v i

the inclination of thecutter 60 i 

